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This fly raised from a larva found in a Mycena (Bonnet) mushroom in a park in Suffolk, UK.
Three maggots were found on 26 Nov 2014.
They pupated around 17 Dec 2014.
This fly emerged on 11 Jan 2015 and it was killed on 13 Jan.
I'll share photos of the fly, pupae, maggot and the mushroom.
Please help me identify this specimen.
The wing length is about 5mm.
If some features are not visible in the photos, please let me know and I will try to capture them.

Best wishes,
Martin

First, a dorsal view